Provided herein is are multilayer damping laminates comprising alternating damping and constraining layers. The materials and configurations of the damping layers are selected such that the damping layers have a decreasing glass transition temperature profile beginning at the first damping layer, allowing the laminates to effectively dissipate vibrations over a wider range of operating temperatures and/or frequencies. Also provided are systems and methods using the multilayer damping laminates.

As disclosed herein, the viscoelastic performance of boron nitride nanotube (BNNT) materials may be enhanced and made into useful formats by utilizing purified BNNTs, aligned BNNTs, isotopically enhanced BNNTs, and density controlled BNNT material. Minimizing the amounts of boron particles, a-BN particles, and h-BN nanocages, and optimizing the h-BN nanosheets has the effect of maximizing the amount of BNNT surface area present that may interact with BNNTs themselves and thereby create the nanotube-to-nanotube friction that generates the viscoelastic behavior over temperatures from near absolute zero to near 1900 K. Aligning the BNNT molecular strands with each other within the BNNT material also generates enhanced friction surfaces. The transport of phonons along the BNNT molecules may be further enhanced by utilizing isotopically enhanced BNNTs.

A mechanism is hereby disclosed that, when activated in the linear direction of its axis, will expand and contract radially. The novel nature of the device is that of compliant methods and materials used in its design. Compliant members, referred to as dyads, translate the motion and imply resistance in a single structure. Thus eliminating the need for separate members, hinges, pins, springs and the associated assembly. When these compliant dyads are combined in the novel configurations hereby disclosed, a device is created that expands (or contracts) in multiple directions from its primary axis of actuation. Furthermore, one or more actuation dyad sets could be arranged at various angles relative to the global vertical axis. The radial expansion/contraction can be 2D or 3D by adding more primary activation dyad sets. Such a device can be applied to many applications and industries. One such application is for gripping the inside of a tube or object for moving manually or in automation. The compliant nature of this device can be optimized to auto-adapt to the objects size and shape allowing for greater part variation and reduce manufacturing line change-over times. Other applications would include snap fit connections, spherical articulating joints, spinning cutting tools, speed limiting using friction and centrifugal force, braking rotational forces or transmitting it, automatic centering, expanding elastic bands in an assembly process, and stretching an opening for fitment. The design of this device is material friendly and can be made of plastic, composite and metals. It may be of a single monoform construction (created by molding, machining, or additive manufacturing) or made of multiple parts including pivots and different materials to achieve the desired articulation.

Provided herein is a vibration reducing sheet comprising a damping patch, a stiffening patch, and a substrate. The substrate is connected to the damping patch and the stiffening patch, and in some embodiments, the damping patch and the stiffening patch do not contact one another. The sheet can be connected to a base structure that is prone to vibrations. Because the damping patch and the stiffening patch can thus be applied to different locations of the base structure, the two patch types can independently be positioned to provide enhanced vibration reduction and mitigation.

A damper member may include a gel-like member and a first film joined to a first surface of the gel-like member in a thickness direction, in which a side surface of the gel-like member located between a second surface opposite to the first surface of the gel-like member in the thickness direction and the first surface is opened.

A mount assembly for a vehicle includes a housing having an upper mounting portion coupled to a first area of the vehicle and a lower mounting portion coupled to a second area of the vehicle. A dampening arrangement is disposed between the upper mounting portion and lower mounting portion. The dampening arrangement may include one or more biasing layers and one or more springs cooperating with the upper mounting portion and lower mounting portion. One or more relatively high viscoelastic layers are disposed adjacent to and cooperate with the one or more biasing layers. One or more relatively low viscoelastic layers are disposed adjacent and cooperate with the one or more relatively high viscoelastic layers. The one or more biasing layers, one or more relatively high viscoelastic layers, one or more relatively low viscoelastic layers and optional springs are configured to dissipate axial forces acting on the mount assembly.

An impact damping mat comprises a plurality of layers arranged in a stacked formation. The stacked formation has a total thickness of no greater than 4 7/16 inches. The plurality of layers cooperate to provide the impact damping mat with at least one of a coefficient of restitution no greater than 30% and a selected sound reduction characteristic. The selected sound reduction characteristic can be a reduction of a maximum sound level of at least 5 dB from 40 to 63 Hz octave bands and at least 13 dB at and above 80 Hz octave bands normalized to a conventional inch rollout rubber flooring product.

An apparatus including a plurality of robot arm links movably connected to one another, where a first one of the robot arm links includes a frame, where the frame has a first end movably connected onto a second one of the robot arm links; and at least one vibration damper arrangement on the frame of the first robot arm link, where the at least one vibration damper arrangement includes at least one viscoelastic element connected to the frame of the first robot arm link by a connection such that, as the frame of the first robot arm link experiences vibrations, the at least one viscoelastic element dampens the vibrations in the frame of the first robot arm link based upon viscoelasticity and the connection of the at least one viscoelastic element to the frame of the first robot arm link.

A motor vehicle transmission assembly is provided that includes a dampening component configured to reduce at least one of noise and vibration within the transmission assembly. In some versions, the dampening component is disposed between first and second transmission components, and the dampening component may be fixed to and/or abutting one of the transmission components. The dampening component may comprise a dampening layer disposed between a pair of outer layers. In some versions, the dampening component has a metallic portion and a non-metallic portion.

A novel disc brake shim and disc brake that can effectively suppress occurrence of vibration and squeal, are easy to manufacture and have excellent quality stability are provided. The disc brake shim includes a base material layer formed of a metal sheet, and a rubber layer that is laminated and disposed on at least a part of a main surface on one side of the base material layer and contains pores derived from a plurality of hollow microcapsules inside, and the disc brake includes pad materials on both sides in an axial direction of a disc rotor, and shims on opposite sides from the disc rotor, of the pad materials adjacently, wherein each of the shims is the disc brake shim of the present invention.